When Treatment Turns to Stone: Injection-Site Calcinosis Associated With Interferon-β in Multiple Sclerosis: A Case Report.

Injection-site calcinosis is a rare complication of interferon-β therapy in multiple sclerosis. We report a 52-year-old woman with stable bilateral gluteal calcifications after long-term subcutaneous interferon-β-1b therapy. Findings were most consistent with probable dystrophic calcinosis cutis secondary to chronic repeated injection-site trauma.